i tested it with arduino in 5V pin and works, but when i use the batteries with a transformer (to transform 6V of batteries to 5V) it doesn't: the robot rotates, but attiny85 doesn't works.. it doesn't tell the servomotors how to move and the robot rotate around himself. it also make a different sound: if i connect it to arduino without batteries the sound is more powerful and every component does his job.. if you have facebook or whatsapp i can send you more photos and videos, the strange thing is that 5V from arduino worked, 5 from batteries not